The Syntonic Principle by Harry Riley Spitler
Upcoming Events
Syntonic Phototherapy 101, March 13-14, 2026: Visalia, Calif.
93rd International Conference on Light and Vision, May 28-30, 2026: Virginia Beach, VA
Syntonic Phototherapy 101, September 26-27, 2026: Columbus, Ohio
Syntonic Phototherapy 101, December 12-13, 2026: in the Northeast U.S.
Patient Information
Our approach to evaluating and improving vision is based on the principle that vision is a learned process. Good vision is not just something we are born with. It must be developed.
Learn More
Find a Practitioner
See our ever growing list of trusted practitioners and get the best care possible in your area.
See the list
